class HDM_Dynamic_Pricing_Bridge {
    
    private $randomizer;
    
    public function __construct() {
        $this->randomizer = new HDM_Randomizer();
        $this->register_smart_hybrid_hooks();
    }
    
    private function register_smart_hybrid_hooks() {
        // DYNAMIC PRICING (for most cases)
        add_filter('woocommerce_product_get_price', [$this, 'calculate_dynamic_price'], 99999, 2);
        add_filter('woocommerce_product_get_sale_price', [$this, 'get_dynamic_sale_price'], 99999, 2);
        add_filter('woocommerce_product_is_on_sale', [$this, 'force_sale_detection'], 99999, 2);
        
        // META UPDATES (only for single product pages)
        add_action('wp', [$this, 'maybe_update_product_meta']);
        
        // PRICE DISPLAY OVERRIDE
        add_filter('woocommerce_get_price_html', [$this, 'override_price_display'], 99999, 2);
    }
    
    /**
     * ONLY update meta on single product pages when needed
     */
    public function maybe_update_product_meta() {
        if (!is_product()) {
            return;
        }
        
        global $post;
        if (!$post) {
            return;
        }
        
        $product_id = $post->ID;
        $discount = $this->get_discount_percentage($product_id);
        
        if ($discount > 0) {
            $this->update_product_meta_safely($product_id, $discount);
        } else {
            $this->clear_product_meta($product_id);
        }
    }
    
    /**
     * SAFE meta update - only what's absolutely necessary
     */
    private function update_product_meta_safely($product_id, $discount) {
        $product = wc_get_product($product_id);
        if (!$product) {
            return;
        }
        
        $regular_price = $product->get_regular_price();
        if (!$regular_price) {
            return;
        }
        
        $sale_price = floatval($regular_price) * (1 - ($discount / 100));
        
        // ONLY update these two meta keys
        update_post_meta($product_id, '_sale_price', $sale_price);
        update_post_meta($product_id, '_price', $sale_price); // This is critical!
        
        // Handle variable products
        if ($product->is_type('variable')) {
            $this->update_variable_product_meta($product_id, $discount);
        }
    }
    
    /**
     * Clean up meta when no discount
     */
    private function clear_product_meta($product_id) {
        delete_post_meta($product_id, '_sale_price');
        
        // Reset _price to regular price
        $product = wc_get_product($product_id);
        if ($product) {
            $regular_price = $product->get_regular_price();
            if ($regular_price) {
                update_post_meta($product_id, '_price', $regular_price);
            }
        }
    }
    

    
    /**
     * Check if product has active HDM discount
     */
    private function has_active_discount($product_id) {
        $current_set = $this->randomizer->get_current_set();
        
        foreach ($current_set as $item) {
            if ($item['product_id'] == $product_id) {
                return true;
            }
        }
        
        // Check for variations
        $product = wc_get_product($product_id);
        if ($product && $product->is_type('variation')) {
            $parent_id = $product->get_parent_id();
            foreach ($current_set as $item) {
                if ($item['product_id'] == $parent_id) {
                    return true;
                }
            }
        }
        
        return false;
    }
    
    /**
     * Get discount percentage for product
     */
    private function get_discount_percentage($product_id) {
        $current_set = $this->randomizer->get_current_set();
        
        foreach ($current_set as $item) {
            if ($item['product_id'] == $product_id) {
                return floatval($item['discount_percentage']);
            }
        }
        
        // Check for variations
        $product = wc_get_product($product_id);
        if ($product && $product->is_type('variation')) {
            $parent_id = $product->get_parent_id();
            foreach ($current_set as $item) {
                if ($item['product_id'] == $parent_id) {
                    return floatval($item['discount_percentage']);
                }
            }
        }
        
        return 0;
    }
    
    /**
     * Calculate dynamic price
     */
    public function calculate_dynamic_price($price, $product) {
        // Skip if no valid price or during cart calculations
        if (empty($price) || !is_numeric($price) || $price <= 0) {
            return $price;
        }
        
        $discount = $this->get_discount_percentage($product->get_id());
        
        if ($discount > 0) {
            $final_price = floatval($price) * (1 - ($discount / 100));
            return $final_price;
        }
        
        return $price;
    }
    
    /**
     * Force sale price return
     */
    public function get_dynamic_sale_price($sale_price, $product) {
        $discount = $this->get_discount_percentage($product->get_id());
        
        if ($discount > 0) {
            $regular_price = $product->get_regular_price();
            if ($regular_price && $regular_price > 0) {
                return floatval($regular_price) * (1 - ($discount / 100));
            }
        }
        
        return $sale_price;
    }
    
    /**
     * Force sale detection
     */
    public function force_sale_detection($is_on_sale, $product) {
        return $is_on_sale || $this->has_active_discount($product->get_id());
    }
    
    /**
     * Override price display completely
     */
    public function override_price_display($price_html, $product) {
        if (!$this->has_active_discount($product->get_id())) {
            return $price_html;
        }
        
        $discount = $this->get_discount_percentage($product->get_id());
        $regular_price = $product->get_regular_price();
        $current_price = $product->get_price();
        
        // Only show sale format if we have valid prices
        if ($regular_price && $current_price && $current_price < $regular_price) {
            return sprintf(
                '<del>%s</del> <ins>%s</ins> <span class="hdm-badge">-%s%%</span>',
                wc_price($regular_price),
                wc_price($current_price),
                $discount
            );
        }
        
        return $price_html;
    }
    
    /**
     * Handle cart prices safely
     */
    public function handle_cart_prices($cart) {
        if (is_admin() && !defined('DOING_AJAX')) {
            return;
        }
        
        foreach ($cart->get_cart() as $cart_item_key => $cart_item) {
            $product = $cart_item['data'];
            $product_id = $cart_item['product_id'];
            
            $discount = $this->get_discount_percentage($product_id);
            
            if ($discount > 0) {
                $regular_price = $product->get_regular_price();
                if ($regular_price && $regular_price > 0) {
                    $discounted_price = floatval($regular_price) * (1 - ($discount / 100));
                    $product->set_price($discounted_price);
                }
            }
        }
    }
}
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